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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '270597b688b2120d6c427039b66a2c1d295f073727b4e5f21e36030754a2ef2d' 
  AND token = 'rK1nMr36CgbYZIDV6lItrIPG8diF/qxCeyx1njRbOm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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