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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f45c57fad36937cafdc5d14447e6cecd67787a78e162741a4ac8a33409587973' 
  AND token = 'nIeHrP8Zt+CIBmd2GdOPI0AzCVB/f6mRf+LvfwEJqaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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