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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '611283425f2675a1b26ea53fb11aaf66aa1ec545dbd26ba5730eb5493f0122ba' 
  AND token = '1Fmcu24A7L8bsrmTSKEt0/oQhE5ACLF/m1s+JkilWDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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