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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad0fb8d465e0224995904cf5762e7bf6b56f46290389f708554ce8be9ae7f5ad' 
  AND token = 'Zd40cF6wKr9cPBDGMx/h9+k0p9eYp4lBKXI+gFgUmrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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