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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d5baf979ef7b85ab2bb2e9965c0a76e0735879c47afbf8bb69c56aa8ec17303' 
  AND token = 'zTrDTZDacK8YuJyrNh1y161Y9535627QoS+Wvj+WZV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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