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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a143df206d33fd59e890bcc6e4f3d3ac5e651fc8056751f47a833b9313205776' 
  AND token = 'kDXaVKbeWrnPHQ7plwwA9kPsKzw6Eb0orgeNvC2R/AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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