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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29055fb3c68e62b9e77e5705f1d96be80cab87c00e387a7524ce8c3ae5dc73f3' 
  AND token = 'hljuY1KNpTD/bLCJG6JyT2C511OiZ68to6+T1DCvnfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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