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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efa068237b0442be3cf472b6b3555349f1bf81f1bbd13dfdf7c1f9433816d4d7' 
  AND token = 'gXDTHFb4yq7vTRxyIUiPsZDDK+b1uIXYGpw0Nb7wSgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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