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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '543de035c70657bc43a99da6288a508db0d83d180f3549e7073e019534d711c9' 
  AND token = 'GOkZHTM8mXNswh5D5bfWTHr5X9DBfCC0mln7W1pBS1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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