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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a55c96f61ab42ec41e55780448101b924fc7bb3f873287d040fd276687909171' 
  AND token = 'o3VepBEb8ch0nVEPvD+Goio6M1ZhMtlcXhvt2jrST9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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