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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e90ccd359c7a56fcd6d3e5d545db460c92988d5147e3758e24007c0e993742e9' 
  AND token = 'YnpgcfMO1dFVEd53AQ+Fy0YyTi15nd9+0gUMzw+IuLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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