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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3236b9deec01fb3c9dc9723ab9ad220ea24ac666c4ad6e009083bd0afc3ee993' 
  AND token = '4WIJia7pemOCIvrbdhjgAfBEniD6038Wf7dueYNhPXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}