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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b63715bd1b73b0d2e8ae2bc6e47d3ef8df69b7ff0c160574047bb6d33133547d' 
  AND token = 'r9lsLXkmjHYMuCf0qpNKlBOTXlBeqHiLxXcepB2J3qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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