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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83908f5ab4ae550866c14a5c9eed9a191637137ff41f1017c366464dcf086df4' 
  AND token = 'rtejk56UsbykDsVoOhADDv6eX8ZzQZ/m8c+7Lq1Lmz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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