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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4da99765ad75f4fb9daf0090ce428f982a2250840c2171305a02be562094935e' 
  AND token = 'z1uac1sDXKmJn6EUDQrRi+2+iOzGm+lhTW6H2D+QeeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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