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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '155bc094d799a3cf3d0658c392c41b3aa34197e58ce8a971d977c71e4822e939' 
  AND token = '4xHqKhGkxi3TqxDFwDxzAgK/L5OphoC66IaVbhSPUcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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