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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c1c42222c75013369df6b3f8f3413ff3fc7f168c5acae326a2802e07144eeab' 
  AND token = 'sdBsLkXc0lhI5VySLNzXCdP52YHmC7ggFVL/bx7eTrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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