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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bf45e304274141e5a8e613191d991829447029146394982b605e569efd713e2' 
  AND token = 'IFP3Kekmld8yGB2QQxFfeNFm/JTaP3oFp6PQlDxAVMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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