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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bb3ced7ae059bc6405ec49fddb527d87d80b2ab96bba7a30eabfa4433200fe3' 
  AND token = '2eRB79JiRI1eWpLpfa/EnVnsADt+Yz5Wx8Ne1RVmAGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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