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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55de93f8c1474e92431c45b0d7a362b27e162eaff1f290e84d14c4e213dc7881' 
  AND token = 'TKxfrUwElf7cnQtr0OQsoUqfQfcQ77RgXStdh7KUBJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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