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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c99e830f3c848a4d1465f741ed58b8ffa121fd0c40f988c55dafb94d4c0659f4' 
  AND token = 'vt8LhN+0UIHPU6Y0NJOrBj54R6ts2RQ2QBiyLulldqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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