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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c0f3e455472a1452b694cce87ce5a99a1eb1aa3c24693d5e79eda3374ff4eba' 
  AND token = '9hD1v+TZ3N0tncH7RL9A2LWG9Q7MEVH8qryaLTIhnSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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