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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce0f4a5ded8829020b91809e7145f7bbaacd3337d4b8555801a3e926a8a3ab15' 
  AND token = 'aDnLG94kYUgLnDK1ddsmQHerLA18ScrJTf4mmZLiiPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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