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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '473dbecd39bd6e101bb06ec282c9b8ac8d182a43fa0556bf9f4d0028406900d3' 
  AND token = 'yHvzRF4mNEL9bCpLPB7EIzrOj2zH3dddkMfeC3FDUsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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