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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc85b690d2ace16ddc91c9d3bf2ac0dc0045a69410ae12aa5fbd7373b228a5f' 
  AND token = 'ZGabjDvR2eJy5qFqHYu+Xrsr5Uyh+bRIsXaEIZdL4eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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