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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9991eb8fd14a3baa3f784b8d356ea965edd382e4f92034d52f534f05c38db0d9' 
  AND token = '1DdXKQj2lBu/OWRsjMd5AAxBL63CMBTphq+4U/Gu0qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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