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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a13ff763c5d92301edbde66a2a71e97fa169fdce7d9af7e709f55f77d486a3f1' 
  AND token = 'z1d8jy53fYTMgTD5hsWiGYN3HMQmNPOnwhNbeDPVGwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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