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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ff5f4454882f4c9b8f390e926e091fa2a9483c7a14bb190a3b92ff4176ed8a4' 
  AND token = 'NIXhN01etpDrjPbABDdO0gLngof0wKp+z9owMReWKDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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