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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcebb09b655b45e70e9e33e1eccc7a2ac33bfd80a6163119dacce74a28ff4bdc' 
  AND token = 'LVdBYaT9SG08Cy6dZw9ZcLT6nd9VWm3nugwdcUB9RZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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