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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b5f095fe2aab23bc1bbda060adcf0bb881cd131b3dc67c79a9642b905aa2e3b' 
  AND token = 'mj8wlQPu7NApvffBb3fNO7clBOxbD7GDjp9fg5H8H9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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