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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de61cb6a40219a0c44a6bb98d0e944456c6f7b31bb9853ce049c9c3c43e5bce7' 
  AND token = 'G61NGOm+9No5IfcfQtNFuuWO5kq4HxBLoHZe/UFiuA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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