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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad2526e21ec52db1c977b79c63643872a92854e5900ef4d041181bcebde85d95' 
  AND token = 's6xp0MrbaRhUMfOsgooM6BhzO5SPhBXvRntYyzgltVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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