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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c4654a284cc84a077f10e720f37ecca1632fa141dbf947035f2ad3e94e873f7' 
  AND token = 'b5mVAkA6gj+lQk/FwFveLfwRQC3wGxIOkflCQA3ZRNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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