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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd53816be77f0db7a0d5e50d3c209282ccb4d9bc9fae5bcbeb908288d692c9d' 
  AND token = 'VE3+Jk8cGt3BmraXVSW3ZvprCzwPGtJ7ykLgIkWiwCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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