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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3aad6e51ac5dfdc3dbeb14ecbd1cb653d4320a95bcbad5224309521abd8fb08' 
  AND token = 'J0/l+nzLqwGkscV77AfQgvbYEcPNX8eEvCSl/TtlOPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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