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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b99634651518225dadc35e5a96c997d3e3ae864613b01e71c6921212ff8a2148' 
  AND token = 'oegp006cRs65ZZIbQlB8STPjN0KwwKC/BxYMOlSYonw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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