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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44e93037ba9714935a52d85d3edfd5d0d36f9aa020b1a7ae6113581af4d63a5e' 
  AND token = 'sAiGkbJZ72bcIWutRJToO3N6fAAE4Z6SvJOj7r6Z5Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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