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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d0563552a4c142a31a1c9ff5cbdbe96e3b39a375c86c18e4c1a45f6198cde7' 
  AND token = 'hU/40K+kbJDZt/hwo6ErU/K9sg4HintYNHfDQfSEpbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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