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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c6803993bdb53d52c432dd70fcf7c79ff197f6da2e7c6ac1b80a2d50f72f5bf' 
  AND token = '38B/u4BhnyH0wAUWQ/xJpRIc3AQz4JI4bTO025mbg3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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