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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30faf268e56e3df6de8b099d265afd447ae5e59032b7c9d0fa8069dc9275b6eb' 
  AND token = 'xni4EkBGIU4xyWWlVGSCdbsa+CotQ8JxKD15BsSA9AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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