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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a149e210b3a2a7549d687ebc8efde62ba4f01f9482c2587bff314703b29e7e' 
  AND token = 'QrAkb03aLHHspe7zBtaEMbrsX9XWyKJ2gMtKJwZr7pU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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