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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ac3b697d6289a9275e86e0f5373d891d7f3532352f3fd67ee3111d5046f479' 
  AND token = 'EjiQDs/4iCJAiScMKLrWX7c4g/MTV20xqILr/EdvJPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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