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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b9698d36dd8b384e420ac9f8d84995cad5b72d8a5fdef6680202b221c09aa6a' 
  AND token = 'HQp+7kb2bah++jpzKY+MKjuQqIdz9KE+l5NPm6HJhuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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