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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04a0fc3f2f7f01f90023ece4855babf80cd7abaaced1bc55a8f6d4b25e769e8b' 
  AND token = 'K//IfBfQiPAU09TLk2VZowJkARVuOJ9/BZU9WgpnZZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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