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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a86ba10dfc285b56f1d82fc1372c559729779cf7ab7de6e5f5343987bada137' 
  AND token = 'R0bhWEFC9SDjEshZcHmvIaDKoqfR4KlRAtn+pUFDyE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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