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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f794e1e7cfe880359ce7cf2d7a023cd62ec184c8804b4f2a14280fdba52e37' 
  AND token = 'WNbrmbtQY4oF5QnaBCc9EeK3S80XMIYDgY3X6Ark9o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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