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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d932e332a2f465a585be37a35cc3a6c63ab70955fc409ac2f6b8551303ef7c' 
  AND token = 'pjJK4iF0byGiSwf5telRJbhXHAfT6MYk+6KtUIvev14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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