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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e93513bb3bd81beee0e35c2bde5787098a2a195c1c2bd52c6204ca0673218d1' 
  AND token = '98pyuBdcAIYaBcEdMNX9Kh50D9dfUBeOaT+V9JwDmvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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