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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032dfe7d320c73a3173f5752610e93236e299d4eee59e741ab95c71a291bdc1e' 
  AND token = 'ISyBpxd9xIL1PuPutDeRaMRVdpT93ykR15/Z8Cz7dnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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