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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f24881add61005e9ad63606c53ddffb07ae3463b0c494577a8b997bad509508' 
  AND token = 'jEqYJJMnecyy/vROKIXctCizMeWi71Nqzs74Fkfvyqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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