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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb051981d335ebf54c0e5921533f4f931c8e72c54108a03bf1502d42b3682b6' 
  AND token = 'IAp4W1q95OtR6Pf5ISoJSZzjE2JUBf4iji5LpKG2108=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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