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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae9048dedb0213f30475006da898ffa793651fabc625a6c0473664d66b11ca0a' 
  AND token = 'uvLxbd8nOJ/svxw612qiRPbwPZXpeo2hZ0rTj9NcDhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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