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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86070c53d8faf3658753c920cd030c41175cbadafed58e3bae06f91c57b974e9' 
  AND token = 'ln/agpfMqvK/G/nuUR6+er88UgHJEmVh/VfpCtTSax4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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