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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411a25c08ae48ab472018256e6b9d9df8dcb0d74e2cacda53c57e22f12128414' 
  AND token = 'hTQgX+MTiAApSNoyKSnzi/ZagkGs98bbLLC6QKYLQZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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