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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f870f236115f778af5ce280e1fa939e17be39af26f8089dbb3a865a96bc09eb8' 
  AND token = 'sdsMow9eEuiZnT3WonBC8HB5sGAfOGfVs7MMEA6vVFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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