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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4a2e1190411ff480256d9dd9f95bc743dd7724a5e1d8e358712cc90662ffccd' 
  AND token = 'gQjMiKk04ErLTDxG5y42uH0O9GTHVI9TXQ3I0eieEwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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