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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef5d9014f623310c5454f6fd2992b818992d3434d8eabd280e07dbfb05f7cc9f' 
  AND token = 'QfhabNS9yc3xvADKCYfVHvw92htOj1lJUNX4gOfryuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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