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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba384e4c924f1ab67b53118d38795e8b7129e7346489ab45ee4def8945f2a264' 
  AND token = 'AuYsJ5YRtzcVvGegDRHu5hs4QUwcUyvLbdJ7A1ENgpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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