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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cac7722a65d25c6c9b214a7759ec99bc676785e28096ee105fd0feeb98451d6b' 
  AND token = 'OPCPMOxqeX2Vje9I+Uh5zqXp9gEj/MWBvn6SV3BF2Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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