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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc74bbf3bf036ba2b658383391ee373e8651ae9dd85b572d11d0f70ea25eb9bd' 
  AND token = 'sU/5VHs0GemjmhXb8XXaPlwR03xHqx84V/eGIMu48XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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