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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9f8a85a8f117c0a760ec9d86c6133c135869883eaa515c3819d9a2f75267cf' 
  AND token = 'lo1yUwCieOHrqo6ILHc0qZ2osFTwhN3MJ7+pkm8XYOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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