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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c39c64bc2063047900c8b03041cf39603e77ac0a70cffd8fe8d7534f7c33fd' 
  AND token = 'wO9Uf7bjn9VYzsy5lkdhprDyx/ygb0+AMg9yYpyXq14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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