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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '682832a7273df3af476a43e3025f55b007719d084b88e7de2e05db60784841e5' 
  AND token = 'mBgp3l9KSQf64oEu76tZgmxtcc6Qr9KqvZyOux1YL3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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