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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2af63a823fb1fb7573610e8d09971f7a2410c01ccf7c0ed4fef8a9f265dbac2f' 
  AND token = 'hXzkXuU22HqHQxOSBacu8yL2OPeTLvK0Gm/cfVliw1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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