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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e0e9d7dbeba68f09370d409ea76bb94812935bb71aa8fee8c1f72b0924417c' 
  AND token = 'lsUXjg14/PXf/PKe8yR1RdF2aye507+ECp1QzNuYwK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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