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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25198ce3e3a2baede71e895ae04105c3942f21041e0047e02b814cf7ff6de70e' 
  AND token = '1pwnrnZWNitmMq6HhGPD/rMxlOk4/dPxoiCIEcmZSt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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