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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c25d7e79599e363cd06d5d2323ae8e690304bf26c41008c5e6b08817c5f98af7' 
  AND token = '65zo9k5w53RcGJBEDqqrvogZ6u1eoAnVlaF8MRl8h8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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