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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1937b2a85855ff0a65e984da63995fcf85ab39b739fedaabf8abc740f464b022' 
  AND token = 'wGM02kXV+4t9/H5gNsIwmGDKCxYnQexX597LvNgib6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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