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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3669f72d3dbbb97c6f02976e40c17f8cb0fac03f914714b2ae3df629e2a91dfd' 
  AND token = 'ZmjvNfl40/9s8f3WECP5Sm1YMMKxpQAW0uAGQgg85h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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