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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45ea94a5ed22eb4bfc723953ea289e4f32dbdc835c68066b9b65443061442eba' 
  AND token = '6HZhvnnv8oO5b32EjEiMdPdzo6KCnigZ8qlnSxeiJiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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