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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '780698ee7dcc41f01b1c7f219f0d54333ee5bbaaa0cdc9a079a6767d25fae10f' 
  AND token = 'Nr8+5WVjLiX89xip+Fs1JfT7a8dMgA2nFv3JiRQ1j/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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