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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc909694949b77f8d12280add6fb536991f8dcabe2f0fc8f46f9cda02b63a1c7' 
  AND token = '1XUbbRzKjJQaRqRV5upa9izEQuf7sHs6J4yRnN2zBhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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