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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae724657e37b0e8d542d90fb6429be2c62840bd90c8712c2841c93e4296b59c' 
  AND token = 'l78fDOq2S8XW8sLhfdWfOzWOefR01UlDeZdpuyzXgUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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