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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e47e1595646ca415e5c7752affa43ae85c5a533ce9ce3de6732a3dfb73976fc' 
  AND token = 'Dm+CgmUPbZ0aggeazR7gjnGVn9qbRVSKfKkIBcWLUqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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