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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd193e22a8bdd51fadb5ec035c24d049092d465636b46625149e366d9d17eb101' 
  AND token = '0KsTh3qzP55hDxAtqTXnSbyGywfs0fcRHY/1Y11by6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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