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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '128c0fe2f49875b0321f0dccb0ae2576570510c723d636016b12107367e95b8d' 
  AND token = 'fVyzVkEwcQZtqGy7WgyMR7Td0sSQuByDZ/HUQRy/6WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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