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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed7b516f80e1c5a7bc3fc018a338b667af729c149d1228bc3c487d98e7f2052e' 
  AND token = '2bfNorT0Zttcu9qbwfGbX/jhookTbHIgRem7rfWrmG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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